Move IC from Gradle to compiler

Reasons for moving:
1. Integration with Kotlin daemon for Gradle.
Gradle bundles Kotlin compiler (kotlin-compiler-embeddable) since Gradle 3.2.
There is no plugin isolation in Gradle, so strange compilation errors/exceptions may happen.
We decided to fix this problem by compiling out-of-process using Kotlin daemon.

Reasons for moving IC to the compiler:
* Better isolation from Gradle process.
* Incremental compilation logic is not scattered across two process and multiple modules.
* Makes it possible to implement standalone CLI IC

compiler/incremental-compilation-impl/incremental-compilation-impl.iml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="intellij-core" level="project" />
+    <orderEntry type="library" name="kotlin-runtime" level="project" />
+    <orderEntry type="module" module-name="build-common" />
+    <orderEntry type="module" module-name="cli" />
+    <orderEntry type="module" module-name="descriptor.loader.java" />
+    <orderEntry type="module" module-name="frontend" />
+    <orderEntry type="module" module-name="frontend.java" />
+    <orderEntry type="module" module-name="util" />
+  </component>
+</module>